.activity-grid{width:100%;position:relative;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;padding:1rem}.activity-year{margin-bottom:3rem;position:relative}.year-label{font-size:1.5rem;font-weight:600;fill:#333;margin-bottom:1rem}.year-summary{position:absolute;right:0;top:0;font-size:0.875rem;color:#666}.month-label{font-size:11px;fill:#767676;font-weight:500}.day-label{font-size:10px;fill:#767676}.activity-cell{fill:#ebedf0;shape-rendering:geometricPrecision;transition:fill 0.15s ease-in-out}.activity-cell:hover{stroke:#1f6feb;stroke-width:1px}.activity-cell.active-l1{fill:#ffcc80}.activity-cell.active-l2{fill:#ff9800}.activity-cell.active-l3{fill:#f57c00}.activity-cell.active-l4{fill:#e65100}.d3-tooltip{position:absolute;padding:10px 14px;background:rgba(0,0,0,0.9);color:#fff;border-radius:8px;font-size:13px;pointer-events:none;z-index:1000;box-shadow:0 6px 12px rgba(0,0,0,0.3);max-width:300px;line-height:1.6;border:1px solid rgba(255,152,1,0.3)}.d3-tooltip strong{color:#ff9801;display:block;margin-bottom:6px;font-size:13px}.d3-tooltip .tooltip-date{color:#ff9801;font-weight:600}.d3-tooltip .tooltip-info{color:#e0e0e0;font-size:12px;margin-top:2px;display:block}